Why is it better to only dehydrate one hand at a time

I don't think it works like that dawg

Well if your talking about what I think its because it will lead to dirty and unproperly cleaning and care of nails. Also here's some other titles that may help you

(“One of the most common mistakes nail technicians make in nail preparation is … is not being used to clean, dehydrate and prep the nails before application)

(Most experts recommend that you use Nail Dehydrators and Non-Acid Based Primers. They are generally safer and less harsh on your nails.)

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.